EnglishAges 10-12

Prefixes & root words

Combine prefixes with root words and explain how the prefix changes the meaning. Review suitability for your learners before teaching.

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Age band:Ages 10-12 Ages 13-15

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Worksheet StudioPractice pack · Ages 10-12

Prefixes & root words

Take your time. Show your thinking.

1. Add the prefix “sub-” (meaning “under”) to “marine”. Write the new word.
“sub-” · “under” · Prefixes & root words
2. Add the prefix “tri-” (meaning “three”) to “angle”. Write the new word.
“tri-” · “three” · Prefixes & root words
3. Add the suffix “-ness” (forming a quality noun) to “bright”. Write the new word.
“-ness” · “bright” · Prefixes & root words
4. Add the prefix “un-” (meaning “not”) to “certain”. Write the new word.
“un-” · “not” · Prefixes & root words
5. Add the suffix “-ment” (forming an action or result noun) to “improve”. Write the new word.
“-ment” · “improve” · Prefixes & root words
6. Add the prefix “inter-” (meaning “between”) to “national”. Write the new word.
“inter-” · “between” · Prefixes & root words
7. Add the prefix “un-” (meaning “not”) to the root word “happy”. Write the new word.
“un-” · “not” · Prefixes & root words
8. Add the prefix “mis-” (meaning “wrongly”) to “spell”. Write the new word.
“mis-” · “wrongly” · Prefixes & root words
9. Add the prefix “dis-” (meaning “opposite of”) to “connect”. Write the new word.
“dis-” · “opposite of” · Prefixes & root words
10. Add the prefix “pre-” (meaning “before”) to “heat”. Write the new word.
“pre-” · “before” · Prefixes & root words
11. Add the prefix “dis-” (meaning “not” or “opposite of”) to “agree”. Write the new word.
“dis-” · “not” · Prefixes & root words
12. Add the suffix “-less” (meaning “without”) to “care”. Write the new word.
“-less” · “without” · Prefixes & root words

12 questions · Seed 50 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 10-12

Prefixes & root words

Answers and reasoning. Review before teaching.

1. Add the prefix “sub-” (meaning “under”) to “marine”. Write the new word.
submarine
sub- + marine = submarine, meaning under the sea.
2. Add the prefix “tri-” (meaning “three”) to “angle”. Write the new word.
triangle
tri- + angle = triangle, a polygon with three angles.
3. Add the suffix “-ness” (forming a quality noun) to “bright”. Write the new word.
brightness
bright + -ness = brightness.
4. Add the prefix “un-” (meaning “not”) to “certain”. Write the new word.
uncertain
un- + certain = uncertain, meaning not certain.
5. Add the suffix “-ment” (forming an action or result noun) to “improve”. Write the new word.
improvement
improve + -ment = improvement.
6. Add the prefix “inter-” (meaning “between”) to “national”. Write the new word.
international
inter- + national = international, meaning between nations.
7. Add the prefix “un-” (meaning “not”) to the root word “happy”. Write the new word.
unhappy
un- + happy = unhappy, meaning not happy.
8. Add the prefix “mis-” (meaning “wrongly”) to “spell”. Write the new word.
misspell
mis- + spell = misspell, retaining both s letters.
9. Add the prefix “dis-” (meaning “opposite of”) to “connect”. Write the new word.
disconnect
dis- + connect = disconnect.
10. Add the prefix “pre-” (meaning “before”) to “heat”. Write the new word.
preheat
pre- + heat = preheat, meaning to heat beforehand.
11. Add the prefix “dis-” (meaning “not” or “opposite of”) to “agree”. Write the new word.
disagree
dis- + agree = disagree, meaning to hold a different opinion.
12. Add the suffix “-less” (meaning “without”) to “care”. Write the new word.
careless
care + -less = careless.

12 questions · Seed 50 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 10-12

Prefixes & root words

Take your time. Show your thinking.

1. Add the prefix “sub-” (meaning “under”) to “marine”. Write the new word.
“sub-” · “under” · Prefixes & root words
2. Add the prefix “tri-” (meaning “three”) to “angle”. Write the new word.
“tri-” · “three” · Prefixes & root words
3. Add the suffix “-ness” (forming a quality noun) to “bright”. Write the new word.
“-ness” · “bright” · Prefixes & root words
4. Add the prefix “un-” (meaning “not”) to “certain”. Write the new word.
“un-” · “not” · Prefixes & root words
5. Add the suffix “-ment” (forming an action or result noun) to “improve”. Write the new word.
“-ment” · “improve” · Prefixes & root words
6. Add the prefix “inter-” (meaning “between”) to “national”. Write the new word.
“inter-” · “between” · Prefixes & root words
7. Add the prefix “un-” (meaning “not”) to the root word “happy”. Write the new word.
“un-” · “not” · Prefixes & root words
8. Add the prefix “mis-” (meaning “wrongly”) to “spell”. Write the new word.
“mis-” · “wrongly” · Prefixes & root words
9. Add the prefix “dis-” (meaning “opposite of”) to “connect”. Write the new word.
“dis-” · “opposite of” · Prefixes & root words
10. Add the prefix “pre-” (meaning “before”) to “heat”. Write the new word.
“pre-” · “before” · Prefixes & root words
11. Add the prefix “dis-” (meaning “not” or “opposite of”) to “agree”. Write the new word.
“dis-” · “not” · Prefixes & root words
12. Add the suffix “-less” (meaning “without”) to “care”. Write the new word.
“-less” · “without” · Prefixes & root words

12 questions · Seed 50 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 10-12

Prefixes & root words

Answers and reasoning. Review before teaching.

1. Add the prefix “sub-” (meaning “under”) to “marine”. Write the new word.
submarine
sub- + marine = submarine, meaning under the sea.
2. Add the prefix “tri-” (meaning “three”) to “angle”. Write the new word.
triangle
tri- + angle = triangle, a polygon with three angles.
3. Add the suffix “-ness” (forming a quality noun) to “bright”. Write the new word.
brightness
bright + -ness = brightness.
4. Add the prefix “un-” (meaning “not”) to “certain”. Write the new word.
uncertain
un- + certain = uncertain, meaning not certain.
5. Add the suffix “-ment” (forming an action or result noun) to “improve”. Write the new word.
improvement
improve + -ment = improvement.
6. Add the prefix “inter-” (meaning “between”) to “national”. Write the new word.
international
inter- + national = international, meaning between nations.
7. Add the prefix “un-” (meaning “not”) to the root word “happy”. Write the new word.
unhappy
un- + happy = unhappy, meaning not happy.
8. Add the prefix “mis-” (meaning “wrongly”) to “spell”. Write the new word.
misspell
mis- + spell = misspell, retaining both s letters.
9. Add the prefix “dis-” (meaning “opposite of”) to “connect”. Write the new word.
disconnect
dis- + connect = disconnect.
10. Add the prefix “pre-” (meaning “before”) to “heat”. Write the new word.
preheat
pre- + heat = preheat, meaning to heat beforehand.
11. Add the prefix “dis-” (meaning “not” or “opposite of”) to “agree”. Write the new word.
disagree
dis- + agree = disagree, meaning to hold a different opinion.
12. Add the suffix “-less” (meaning “without”) to “care”. Write the new word.
careless
care + -less = careless.

12 questions · Seed 50 · Age guidance, not curriculum certification